This commit upgrades the version of pip-tools used in this repository from 6.6.0 to 6.6.2.

In version 6.6.0 of pip-tools, there is a bug that is preventing pip-tools from working. This is breaking the Python requirements update GitHub action in this repository.

The error is "ImportError: cannot import name 'BAR_TYPES' from 'pip._internal.cli.progress_bars'". The error was reported here: https://github.com/jazzband/pip-tools/issues/1617. The fix to this bug was released in version 6.6.2 of pip-tools. See the comment here: https://github.com/jazzband/pip-tools/issues/1617#issuecomment-1126245586.

Version 6.6.1 of pip-tools also has a bug, which is fixed in version 6.6.2. I observed this issue breaking the Python requirements update GitHub action in another repository, so I have upgrade the version straight to 6.6.2. The issue in version 6.6.1 was reported here: https://github.com/jazzband/pip-tools/pull/1624.

* Python code cleanup by the cleanup-python-code Jenkins job.

This pull request was generated by the cleanup-python-code Jenkins job, which ran
```
add_common_constraint; make upgrade
```

The following packages were installed:
`edx-repo-tools`

* Added --django-settings-module to pylint

* Changed position

* Remove django-settings-module from pylint command

* Add django-not-configured in pylintrc

Co-authored-by: Muhammad Soban Javed <58461728+iamsobanjaved@users.noreply.github.com>

This change moves the LTI configuration retrieval to
a Django model that will LTI configuration.
The current model proxies back the to blocks to keep
backwards compatibility.

See reasoning for change at:
https://github.com/edx/xblock-lti-consumer/blob/master/docs/decisions/0001-lti-extensions-plugin.rst

Remove constraints.
Add classifiers.
Update setup.py install_requirements definition.
Update travis file using new requirements.
Create requirements folder.
create pip_tools, base, test and travis requirements files.
Remove old requirement files.
Create Makefile and add upgrade command.
Include requirements files generated using upgrade command.
Update openedx.yml OEPs list.